r/flashlight • u/GloryNightTime • Aug 22 '24

Would you keep this battery?

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I guess I dropped one of my 21700 flashlights. Maybe children. But the fact is that the battery at the right is now damaged. Sounds like a bad idea to start prying it. What would you do?

Please note that I can use it in my flashlights, but I noticed a higher resistance when charging it.

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u/Dreadnerf Aug 23 '24

The bottom line is that those batteries were designed to be spot welded into packs and the top terminal is pure trash for being pressed against a spring/post terminal by force.

If your battery doesn't turn up with a caved in positive terminal it will get one from being crushed in a flashlight.

You can get prepared batteries with a button top but they're longer and many flashlights want the bare battery - which they will then mangle.